These three interests--democratic, scientific, medical--seem at present those chiefly concerned in the task of putting this matter on a definite basis, and it is much to be desired that they should come to some common agreement. They represent three immensely important modes of social and intellectual activity, and the progress of every nation is bound up with an international progress of which they are now the natural pioneers. It cannot be too often repeated that the day has gone by when any progress worthy of the name can be purely national. All the most vital questions of national progress tend to merge themselves into international questions. But before any question of international progress can result in anything but noisy confusion, we need a recognized mode of international intelligence and communication. That is why the question of the auxiliary international language is of actual and vital interest to all who are concerned with the tasks of social hygiene. THE QUESTION ON INTERNATIONAL COINAGE It must be remembered that the international auxiliary language is an organic part of a larger internationalization which must inevitably be effected, and is indeed already coming into being. Two related measures of intercommunication are an international system of postage stamps, and an international coinage, to which may be added an international system of weights and measures, which seems to be already in course of settlement by the increasingly general adoption of the metric system. The introduction of the exchangeable international stamp coupon represents the beginning of a truly international postal system; but it is only a beginning. If a completely developed international postal system were incidentally to deliver some nations, and especially the English, from the depressingly ugly postage stamps they are now condemned to use, this reform would possess a further advantage almost as great as its practical utility. An international coinage is, again, a prime necessity, which would possess immense commercial advantages in addition to the great saving of trouble it would effect. The progress of civilization is already working towards an international coinage. In an interesting paper on this subject ("International Coinage," _Popular Science Monthly_, March, 1910) T.F. van Wagenen writes; "Each in its way, the great commercial nations of the day are unconsciously engaged in the task. The English shilling is working northwards from the Cape of Good Hope, has already come in touch with the German mark and the Portuguese peseta which have been introduced on both the east and west sides of the Continent, and will in due time meet the French franc and Italian lira coming south from the shores of the Mediterranean. In Asia, the Indian rupee, the Russian rouble, the Japanese yen, and the American-Philippine coins are already competing for the patronage of the Malay and the Chinaman. In South America neither American nor European